guys, if you look at Nikon history of bringing out the "S" version, it is between 1 1/4 years (D70-D70s) to 2 1/4 years (D3 to D3s), I suggest that it would not be unusual for Nikon to release the D600S after D600, which has been out for 1 1/2 years already.

1.5 years already? Are you sure you have your dates correct in regards to this???